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A telegraph key, clacker, tapper or morse key is a specialized electrical switch used by a trained operator to transmit text messages in Morse code in a telegraphy system. [1] Keys are used in all forms of electrical telegraph systems, including landline (also called wire) telegraphy and radio (also called wireless) telegraphy .
In 1878, Jesse created his own company, J. H. Bunnell and Co. Jesse constantly developed telegraphic instruments. In 1868 he received a patent for telegraph repeater, [4] printing telegraph, [5] created different telegraph sounders [6] and improved telegraph switchboard. [2] [7] He is famous for his steel lever key, which was patented on 15 ...
An example of a very simple keyer is a single telegraph key, which used for sending Morse code. In such a use, the term "to key" typically means to turn on and off a carrier wave. For example, it is said that one "keys the transmitter" by connecting some low-power stage of the amplifier in a transmitter to its follow-on stage, through the ...
A telegraph operator at the sending end of the line would create the message by tapping on a switch called a telegraph key, which rapidly connects and breaks the circuit to a battery, sending pulses of current down the line. The telegraph sounder was used at the receiving end of the line to make the Morse code message audible.
Larkspur telegraph key. Larkspur was the retrospectively adopted name of a tactical radio system used by the British Army.Its development started in the late 1940s with the first equipment being issued in the mid-1950s.
The Vibroplex Original Bug key has been in continuous production for over 100 years, with only minor cosmetic changes. Numerous Vibroplex keys are available to this day; the company presently markets and sells 27 variations of Morse code keys, including the Original Bug, iambic paddles, the Vibrokeyer (an electronic variant of the Original Bug ...
Coe, Lewis, The Telegraph: A History of Morse's Invention and Its Predecessors in the United States, McFarland, 2003 ISBN 0-7864-1808-7. Lyall, Francis, International Communications: The International Telecommunication Union and the Universal Postal Union, Routledge, 2016 ISBN 1-317-114345. Pope, Frank L. (1881). "Chapter VIII Hints to Learners".
A telegraph code is one of the character encodings used to transmit information by telegraphy. Morse code is the best-known such code.Telegraphy usually refers to the electrical telegraph, but telegraph systems using the optical telegraph were in use before that.